Quote:
Originally Posted by Dadhawk
A keg technically is. It is a half-barrel, with a barrel being part of the official weights and measures. It's like saying "half a gallon" or "half a liter".
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Historically a beer barrel was a standard size of 36 US gallons (140 l; 30 imp gal), as opposed to a wine barrel of 32 US gallons (120 l; 27 imp gal), or an oil barrel of 42 US gallons (160 l; 35 imp gal).
These days, what is considered a "full keg" is 15.5 gallons.